Working with Canon EF 85mm 1:1.2 L II USM___Focus problem

This Canon EF 85mm 1:1.2 L II USM, is technically an interesting lens (I didn't found any service manual for this lens).

The lens had really problems with the auto focus and also with the manuel focus, because the system work's in the way "focus by wire". It work's the way that the focus ring do not have direct contact with the lens system but via encoder electronic and the USM motor.

But the USM motor will over the year's of use getting worn out because of bad material / wrong construction, but also because of the very, very heavy front lens group will worn out the focus helicoid's.
Also, in this lens the way too less amount of grease on the focus helicoid's was not good.

It should simply last much, much longer compare to the high price for this lens...






Here are some link's to different repair tool's and lubricating stuff:


"ORBIT" HEPA Blower:

https://photosol.com/products/orbit-h...

You can buy it here:
https://www.adorama.com/cpkhjdb.html




"Liqui-Moly" LM 50 Litho HT:

https://www.amazon.co.uk/Liqui-Moly-L...



"Liqui-Moly" LM47 MoS2 grease with Molybdenum disulfide:

https://products.liqui-moly.com/lm-47...



or on Amazon:

https://www.amazon.co.uk/Liqui-Moly-3...




Contact glue:

https://www.loctiteproducts.com/en/pr...




Japan Hobby Tool rubber cone:

https://www.amazon.com/Japan-Vacuum-C...



18 different size rubber repair tool's:

https://www.amazon.com/Sizes-Lens-Fil...



You can also buy this set.

Lens Repair Set with pointed, flat, half flat tips:


https://www.amazon.com/dp/B00QRPWCN0/...



JIS cross head screw driver's:


https://www.amazon.com/Moody-Tools-58...


Or this set, that is the set I use:


https://eustore.ifixit.com/en/Tools/D...



Lens cleaning wipes (PEC-PAD):


https://www.amazon.com/dp/B0161VIZZ8/...



Thin Cotton Buds x 200 you can buy them here:

https://www.muji.eu/pages/online.asp?...



DSLRKIT Pro Lens Vise Tool Repair Filter Ring Ajustment Steel 27mm to 130mm:


https://www.amazon.com/DSLRKIT-Repair...


Japan Hobby Tool Helical Grease Made in Japan:

https://www.amazon.com/Japan-Hobby-He...



Loctite 222 50ml Threadlocker

https://www.amazon.com/Henkel-Loctite...